feat: ExperionCrawler IIoT OPC UA Data Bridge Infrastructure

Major project initialization and feature implementation:

**Core Features:**
- OPC UA client for Honeywell Experion HS R530 integration
- Real-time data streaming and history data retrieval
- Text-to-SQL query engine with TimeScaleDB
- JSON-based node configuration system
- SQLite database with migration support

**Architecture:**
- Clean architecture with Domain, Application, Infrastructure layers
- ASP.NET Core Web API frontend
- Web UI with real-time visualization
- PKI-based OPC UA authentication (TLS)

**Infrastructure Components:**
- ExperionOpcClient: OPC UA connection management
- ExperionRealtimeService: Real-time data streaming
- ExperionHistoryService: Historical data queries
- TextToSqlService: Natural language to SQL queries
- SqlValidator: SQL injection prevention

**Database:**
- TimescaleDB integration (recommended) or SQLite fallback
- Entity Framework Core with Extenstion methods
- OPCTag, KeyValue tables for data storage

**Security:**
- Certificate-based OPC UA endpoint security
- SSL/TLS encryption for database connections
- Output param binding injection prevention

**Testing:**
- Unit tests for TextToSqlService and SqlValidator
- Integration tests for Korean time range extraction

See REVIEW_REQUEST.md for detailed code review information.

src/Web/Program.cs

@@ -9,7 +9,12 @@ using Microsoft.EntityFrameworkCore;
 var builder = WebApplication.CreateBuilder(args);
 
 // ── MVC / Swagger ─────────────────────────────────────────────────────────────
-builder.Services.AddControllers();
+builder.Services.AddControllers()
+    .AddJsonOptions(opt =>
+    {
+        // JSON 직렬화 시 대소문자 구분 없이 처리하도록 PascalCase 유지
+        opt.JsonSerializerOptions.PropertyNamingPolicy = null;
+    });
 builder.Services.AddEndpointsApiExplorer();
 builder.Services.AddSwaggerGen(c =>
     c.SwaggerDoc("v1", new() { Title = "ExperionCrawler API", Version = "v1" }));
@@ -17,6 +22,7 @@ builder.Services.AddSwaggerGen(c =>
 // ── Infrastructure ────────────────────────────────────────────────────────────
 builder.Services.AddSingleton<IExperionCertificateService, ExperionCertificateService>();
 builder.Services.AddSingleton<IExperionStatusCodeService, ExperionStatusCodeService>();
+builder.Services.AddSingleton<IOpcUaConfigProvider, OpcUaConfigProvider>();
 builder.Services.AddScoped<IExperionOpcClient,  ExperionOpcClient>();
 builder.Services.AddScoped<IExperionCsvService, ExperionCsvService>();
 builder.Services.AddScoped<AssetLoader>();
@@ -30,7 +36,21 @@ builder.Services.AddScoped<IExperionDbService, ExperionDbService>();
 // ── Application Services ──────────────────────────────────────────────────────
 builder.Services.AddScoped<ExperionCrawlService>();
 
+// ── KST 시간대 관리 서비스 ──────────────────────────────────────────────────
+builder.Services.AddSingleton<IClock, SystemClock>();
+builder.Services.AddSingleton<KstClock>();
+
+// ── 한글 시간 범위 추출기 ──────────────────────────────────────────────────
+builder.Services.AddSingleton<KoreanTimeRangeExtractor>();
+
 // ── Text-to-SQL Service ──────────────────────────────────────────────────────
+builder.Services.AddSingleton<SqlValidatorOptions>(_ => new SqlValidatorOptions
+{
+    RequiredTables   = ["history_table"],
+    AllowedTables    = ["history_table", "node_map_master"],
+    MaxSubqueryDepth = 4
+});
+builder.Services.AddSingleton<SqlValidator>();
 builder.Services.AddScoped<ITextToSqlService, TextToSqlService>();
 
 // ── Realtime & History BackgroundServices ─────────────────────────────────────